PRIOR CONCURRENT THERAPY: Biologic therapy: Recovered from prior biologic therapy No prior bone marrow transplantation Chemotherapy: See Disease Characteristics At least 4 weeks since prior chemotherapy (6 weeks for nitrosoureas or mitomycin) Endocrine therapy: Recovered from prior endocrine therapy Radiotherapy: Recovered from prior radiotherapy No prior external beam radiotherapy Surgery: Recovered from prior surgery Other: At least 1 week since prior antibiotics